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Title: High- and low-Am RE inclusion phases in a U-Np-Pu-Am-Zr alloy

Structural, microstructural, and microchemical data were collected from rare-earth inclusions in an as-cast U-Pu-Zr alloy with ~3 at% Am, 2% Np, and 9% rare-earth elements (La, Ce, Pr, and Nd). Two RE phases with different concentrations of Am were identified. The composition of high-Am RE inclusions is ~2-5 at% La, 15-20 % Ce, 5-10% Pr, 25-45% Nd, 1% Np, 5-10% Pu, and 10-20% Am. Some areas also have O, although this does not appear to be an essential part of the high-Am RE phase. The inclusions have a face-centered cubic structure with a lattice parameter a ~ 0.54 nm. The composition of the only low-Am RE inclusion studied in detail is ~~35-40 at% O, 40-45 % Nd, 1-2% Zr, 4-5% La, 9-10% Ce, and 6-7% Pr. This inclusion is an oxide with a crystal structure similar to the room-temperature structure of Nd2O3. Microstructural features suggest that oxidation occurred during casting, and that early crystallization of high-temperature oxides led to formation of two distinct RE phases.
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  1. Idaho National Lab. (INL), Idaho Falls, ID (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0022-3115; TRN: US1500056
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Nuclear Materials; Journal Volume: 458
Research Org:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; FCC LATTICES; INCLUSIONS; Alloy Nuclear Fuels; Transmutation; Uranium Alloys; Plutonium Alloys; Neptunium Alloys; Americium Alloys; Zirconium Alloys; Lanthanum Alloys; Cerium Alloys; Praseodymium Alloys; Neodymium Alloys; Neodymium Oxides; Zirconium Oxides; Lanthanum Oxides; Cerium Oxides; Praseodymium Oxides; CASTING; CONCENTRATION RATIO; CRYSTALLIZATION; Crystal Structure; MICROSTRUCTURE; OXIDATION; LATTICE PARAMETERS AM PHASES; NUCLEAR FUELS; RARE-EARTH PHASES; U-PU-ZR ALLOYS